Hey Dominik ,
I am a cinematographer and have a big fascination towards cameras. I keep on searching latest cameras on web. But nowadays the cameras are very costly therefore in order to save my money I hire cameras from the site http://www.lightningmedia.co.uk/ that provides all sort of cameras and other accessories and camera equipment on rent.
You can also hire an EVF from this site.
Hope it helps!!
Warm Regards
Jay Walton